Sachin is a dubbibg version of Tamil movie Sachin. Sachin (Vijay) is a carefree and noble-hearted college student, who comes across the beautiful girl Shalini (Genelia) in the College campus and falls in love with her. Vadivelu and Santhanam also studying in same college, they also loves Shalini. Shalini though is a good friend of Sachin, doesn't want to say those three words that he wants her to. It eventually becomes a cat and mouse game.Enters Bipasha Basu, who runs behind Sachin with skimpy costumes, and that makes Shalini go green with envy. Then Sachin comes to know that Shalini's arents have arranged her wedding with an industrialist's son in Canada. He decides to bid goodbye to her and even asks apology for running behind her so long. Now enters Gowtham (Raghuvaran), a rich businessman and father of Sachin. Following a sequence of events, Shalini develops a soft corner for Sachin and decides to express her love to him. And she does after a typical climax in the airport.